Interaction of independent single photons based on integrated nonlinear optics

T. Guerreiro (), E. Pomarico, B. Sanguinetti, N. Sangouard, J. S. Pelc, C. Langrock, M. M. Fejer, H. Zbinden, R. T. Thew and N. Gisin
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T. Guerreiro: Group of Applied Physics, University of Geneva
E. Pomarico: Group of Applied Physics, University of Geneva
B. Sanguinetti: Group of Applied Physics, University of Geneva
N. Sangouard: Group of Applied Physics, University of Geneva
J. S. Pelc: E.L. Ginzton Laboratory, Stanford University, 348 Via Pueblo Mall, Stanford, California 94305, USA
C. Langrock: E.L. Ginzton Laboratory, Stanford University, 348 Via Pueblo Mall, Stanford, California 94305, USA
M. M. Fejer: E.L. Ginzton Laboratory, Stanford University, 348 Via Pueblo Mall, Stanford, California 94305, USA
H. Zbinden: Group of Applied Physics, University of Geneva
R. T. Thew: Group of Applied Physics, University of Geneva
N. Gisin: Group of Applied Physics, University of Geneva

Nature Communications, 2013, vol. 4, issue 1, 1-5

Abstract: Abstract The parametric interaction of light beams in nonlinear materials is usually thought to be too weak to be observed when the fields involved are at the single-photon level. However, such single-photon level nonlinearity is not only fundamentally fascinating but holds great potential for emerging technologies and applications involving heralding entanglement at a distance. Here we use a high-efficiency waveguide to demonstrate the sum-frequency generation between a single photon and a single-photon level coherent state. The use of an integrated, solid state, room temperature device and telecom wavelengths makes this type of system directly applicable to future quantum communication technologies such as device-independent quantum key distribution.

Date: 2013
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DOI: 10.1038/ncomms3324

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